The document discusses different applications of photography including advertising, fashion, music, sports, photojournalism, and fine art. It provides examples of famous photographers within each industry such as Jonathan Knowles in advertising, Sebastian Kim in fashion, Mike Learner in music, Bob Martin in sports, David Burnett in photojournalism, and Ansel Adams in fine art photography. Each industry uses photography in different ways such as to sell products, highlight trends, promote artists and events, tell news stories, and provide artistic visual representations.